451. Nucleus has?
(A) Only neutrons
(B) Only electrons
C) Neutrons and Protons
(D) Electrons and Protons
452. The first evidence of the existence of an atom is recorded by?
A) John Dalton
(B) Joseph John Thomson
(C) Eugene Goldstein
(D) Rutherford
453. Which is the hardest-known natural mineral?
(A) Graphite
(B) Diamond
C) Tungsten
(D) Cobalt
454. Avogadro’s number is?
A) 6.02×10^23
(B) 6.02×10^24
(C) 6.00×10^23
(D) 6.62×10^23
455. Line spectrum is the characteristic property of a substance in __ state:
(A) Gaseous
B) Liquid
(C) Solid
(D) Crystalline
456. The number of spectral lines obtained when an electron jumps from the 5th to 1st Bohr Orbit:
A. 3
B. 10
C. 11
D. 12
457. Numbers of orbitals in the 3rd shell are:
A. 3
B. 6
C. 9
D. 18
458. Total number of nodes in 5s orbitals is:
A. 5
B. 4
C. 3
D. 2
459. Among the following, the electron deficient compound is:
A. BCl3
B. CCl4
C. PCl5
D. CH4
460. In which of the following Compounds the bond angle will be maximum:
A. NH3
B. N+H4
C. PCl3
D. BeCl2
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